Alarm Acquisition Function; Controlling Alarms; Processing Details - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.4

Alarm Acquisition Function

The RJ71PN92 acquires an alarm that has occurred in the IO device.
When the RJ71PN92 receives an alarm of the IO device, it acquires the alarm information and returns the alarm ACK to the
IO device.
• When an alarm has occurred in the IO device, the alarm information is sent from the IO device to the
RJ71PN92. Alarms are classified into high-priority alarms and low-priority alarms. The RJ71PN92 can
receive both alarms simultaneously. (The alarm priority varies depending on the IO device.)
• After the RJ71PN92 has received an alarm, the IO device cannot send the next alarm unless the IO device
receives the alarm ACK from the RJ71PN92.

Controlling alarms

As the methods of controlling the alarm of each IO device, the alarm automatic processing and alarm manual processing are
provided.
Set one of the methods in 'IO device alarm management area' (Un\G17025 to Un\G17032).
Item
Alarm automatic processing (Default)
Alarm manual processing

Processing details

Alarm automatic processing
This processing automatically returns the alarm ACK to the alarm that has been received from each IO device.
In the alarm automatic processing, even after the RJ71PN92 has received an alarm from the IO device, the status of 'IO
device alarm indication area' (Un\G17145 to Un\G17152) does not change.
Set the alarm automatic processing at the system start-up or when the alarm needs to be disabled. Set the alarm manual
processing after the system has started.
Description
Automatically returns the alarm ACK to the alarm that has been received from each IO device.
Stores alarm information in 'IO device alarm indication area' (Un\G17145 to Un\G17152) when the RJ71PN92 has
received an alarm from each IO device.
This processing uses the service interface function to execute the alarm request and alarm ACK.
1 FUNCTIONS
1.4 Alarm Acquisition Function
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